Good Riddles

Question: Although I'm far from the point, I'm not a mistake.
I fix yours.

What am I?

Question: A man is in court for killing his wife. In the closing statements the man's lawyer surprises everyone when he announces "His wife was just missing. Everyone look at those doors. His wife is going to walk in those doors in about 30 seconds."The entire court is silent and the jury stares at the door as the lawyer and the defendant stare at them. After a couple of minutes the lawyer says "See! If you were so sure he killed his wife, you wouldn't be watching that door!"The jury goes into deliberation and comes back almost immediately with a guilty verdict.Why did the jury convict him?

Question: Two men play five sets of tennis together and each win three sets.

How is this possible?

Question: A man was born on January 1st, 23 B.C. and died January 2nd, 23 A.D. How old did he live to be?

Question: I give you a family of three:

One is sits down, and will never get up.
The second eats as much as is given to him, yet is always hungry.
The third goes away and will never return.

What are they?